Hallo,
after I had successfully "ported" barebox to about 5 different embedded
x86 (mostly N270 and Z510 Atom boards) I ran into problems with a
Celeron SU2300 CPU based board. After a lot of trail and error, which
included the implementation of a BIOS based console cause the board does
not have a RS232 port, it looked like the global variables were not what
I expected them to be, namely zero.
So in arch/x86/boot/main_entry.c i changed to following;
/**
* Called plainly from assembler that switches from real to flat mode
*
* @note The C environment isn't initialized yet
*/
void uboot_entry(void)
{
#if 0
/* clear the BSS first */
memset(__bss_start, 0x00, __bss_stop - __bss_start);
#else
unsigned char* ptr;
for (ptr = __bss_start; ptr < __bss_stop; ptr++)
*ptr = 0x00;
#endif
start_barebox();
}
After doing that it works. I have not yet looked into the resulting asm
to find the differences, but could someone have an explanation for why
the memset doesn't work and the simple loop does work?
- Erwin
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